Sawmill dog



June 7, 1932. R. E. LANGILI. ET A1.

SAWMI LL DOG Filed Aug. l, 1931 4 Sheets-Sheet INVENTOR.

mvaagm, da@ )779 Mb hmulu( a .TToRNEYs R. E. LANGILI. ET Ai. 1,861,867

SAWMILL DOG Filed Aug. l, 1931 4 Sheets-Sheet 2 June 7, 1932.

i NVENTOR. @y z. .J BY I @14%, ww' )ne )IMQ v ATTORNEYJ` June 7, 1932 R. E. LANGiLL. ET Al. 1,861,867

SAWMILL DOG Filed Aug. l, 1931 4 Sheets-Sheet 5 INVENTOR.

June 7, 1932. R. E. LANGILL ET AL SAWMILL DOG Filed Aug. l, 1931 4. Sheets-Sheet 4 Patented June 7, 1932 UNITED gs'm'ras ROSS E. LANGLL, F lill:EN()IMEUEIE,Y MOHIGAN, AND WILLIAM B. GRUETER, 0F MIL-v" y: W'AUKEE, XVISCONSIN, ASSIGNORS TO THE PRESCOTT COMPANY, OF MENOMINEE, l T'ICHIGAN, .AV CORPORATION OF MICHIGAN I i i SAWMILL DOG- Original application led September 16, 1925, Serial No. 56,590. Divided and this n 1, 1931. Serial No. 554,520.

rlhis inventionVV relates to an improvement in sawmill dogs. The present application is' a division oit' our pending application for sawmill dogs, tiled September 16, 1925, Serial No. 56,590.

Sawmill dogs of the character of the present invention include upper and lower tongs supported tor movement toward and laway from each other in a vertical plane and also supported for movement transversely or in and out relative to the face 'of the knee oi the sawmill carriage together with a motor organization for imparting the `vertical and transverse movement to the dogs.

The object of thepresent inventionis to provide a novel arrangement for guiding the tongs,'especially the upper tong, for vertical .movement in various adjustments transversely with respect to the knee face andv also to provide a novel structural organization `for shifting the upper and lower tongs in and out relative to the knee face under the power of the motor provided for this purpose.

Other objects and advantages reside in certain novel features or" the construction, arrangement and combination Vofparts which will be hereinafter more fully described and particularly pointed out in the appended claims, reference being had to the accompanying drawings, forming a'part of this specification, and in which: l

Figure 1 is a view in side elevation showing a sawmill dog constructed inaccordance with the present invention; Y l Y Figure 2 is a view in section taken on lin 2 2 -ofFigure 1, and showing the parts on an enlarged scale;

Figure 3 is a fragmentary view taken in section on line "8 3 .of Figure 1 and showing the means employed for constraining the upper tong to vertical movement in either transverse adjustment; l

Figure 4 is a detail sectional view .taken on line 4 4 of Figure 1;

l'ookj PATENT orFic""'Elv application IeduguSt Referring tothe dra-wings, and more vparticularly to Figure 1, the numerall desig' nates a knee'o a sawmill carriage having a face`2 and a'base 3. The base 3 is slidably mounted in the usual manner kupon a head block 4vfor transverse movement with re;-

spectto the log carriage. The transverse adjustment 'of the kneefrelative lto the carriage may be effected trom a set shaft 6 in any conventional or well known manner.' 'For a full and complete disclosure o1 one means for eiiecting suchtrans'verse adjustment of. the

knee reference is made to our'pending ap'- plication;v identified above. Arms 11and 12 are keyed to the ends of a rocker-shaft 13' journa'led in a bearing 14 which Vmay be formed. 'integrally -with the base of knee 1, the .upper ends-of arms 11 and 12 receiving thev ends of a shaft 15 which passes loosely through bearings 16 Yformed on'the underside of the upper tong'arm 17 whereby the rear end of the latter is pivotally connectedrto and supported by arms 11 and 12. APins 18 and 19 are provided with reducedv ends 2O which pass, through tong arm 17 and with heads 21, the pins being held in position by means of. nuts 22threaded upon the ends thereof. Pins 18 and :19 are selectively adapted for sliding movement in a channel 23 formed by means of strips 24 and 25 arranged in vparallel relation to each other and to the tace of the knee land secured bynmeans ,of bolts 26 to a vertical member 27; member 27 being secured to one side of knee 1 by means. of bolts 28. As shown in Fig.- 3, the adjacent edges ot strips 24 and 25 tit loosely between arm 17 and head 21 of pin 18 whereby the latter is held in position in channel 23 for sliding movement along the same. Pins 18 and 19 may be provided with collars 29'fwhi'chloosely tit the pins and provide for a rolling action between f the same and strips 24 and 25 upon movement of tong arm ,17 `in av vertical plane. 1 The thereto is pivotally mounted intermediate its ends on the rocker shaft 13 which extends loosely through lcollar 38, the lower end lof arm 40 being bifurcated and pivotally connected to the end of` arm 36 rby means of a pin 41. Arm 12 is enlarged at the center thereof to form a frame 42 in whichV an aperturedpin 43 is pivotally mounted, .as more clearly shown in Fig. 2, -a bolt 44 passing Y through pin 43 and being pivotally connected at 45 to arm 39 of lever 37 `A spring 46 is arranged' upon bolt 44 and held slightly compressed'between pin 43 and nuts 47 threaded vupon the end of bolt 44. An adjustable bolt 48 is threaded into the end of arm '39 andengages the adjacent edge of arm 12 Vfor the kpurpose hereinafter explained.

. The rear end of the lowertong arm 49 fits into the lower bifurcated end of a hanger 50 having its upper end loosely mounted on Jrocker shaft 13 and is pivotally connected to the lower end of :hanger 50 by means of a pin 51 hanger 50 thereby'supporting the rear end of tong arm 49. One end of a' link 52' `also fits into the llower bifurcated endr of hanger 50 and' 'is also pivotally connected thereto by. means of pin51, the other end of link 52 lbeing loosely mounted on an eccentric vor crank. pin 53 yfixed in a lug Y54 which may be formed integral with. eccentric 33, this end of link 52v being held upon pin 53 by any suitable means such as a nut 55 threaded upon the end of the latter. Adjustable stops or bolts 56 and 57 are threaded intolugs 58 which may beV cast integrally Y with `the-base3 of knee 1 and are arranged,

as shown in Fig. 7, toengage the opposite sides of block 54 to limit rotary movement of shaft 32 through an angle of 180O for the purpose hereinafter explained."

The forwardend oftong afrm 49 is slidably mounted in a shoe 59 provided with a pin 60 which is similar to pins 18 and 19 and is arranged in channel 23', as shown in Fig. V4,

for sliding movementV along the same. As more clearly shown in Figs. 1 and 5, shoe 59. is .provided with a lug 6.1 arrangedY toengage with the head 62 of `bolt 63k loosely mounted in lugs 64 and 65 cast integrally with member 27, a spring166 being arranged on bolt 63 between lug 64 and a washer 67 held between *a shoulder 68 in the bolt and aA sleeve 69 :fitted uponthe latter' and. held in position bymeans of nuts '70 Athreaded upon the' end of the bolt. One edge of a plate 71, arranged upon bolt 63 as shown, its against the adjacent face of knee 1 and is provided with an opening to receive a pin 72 fixed in head 62 of bolt 63, the engagement of plate 71 with knee 1 and its connection by means of pin 72 with the head of bolt 63 acting to hold' the latter lagainst rotary movement in lugs 64 and 65 whereby the head of the bolt and plate 71 Yassociatedtherewithare always in the positionshown in Fig. 5 for engagement with lug 61 of shoe 59, bolt 63 thereby acting as a stop t0 support the forward end of tong arm 49 when the latter is in its lowermostV position, spring 66 being compressed upon engagement by lug 61 with plate 71 and thus acting as-a cushion.;

The mechanism -for eifecting movement of tong arms 17 and 49 in a vertical plane will now be described.

As shown in Fig. l, this mechanism comprises a reversible Velectric motor 115, the stator of which is securely bolted tothe upper tong 17 and the armature shaft 115 of which is connected by a coupling 109 to a worm shaft 1.03. The shaft 103`is journaled in bearings prOv-ided'therefor in a casing 73 and has arworm l104 fixed thereto andmeshing with a worm wheel89 mounted on and having appropriate .friction driving connection with a shaft 80 supportedvfor rotationsifn bearings provided therefor on thecasing '73. and tong a-rm 17. lllhe casing 73 is securely bolted to the tong -arm 17. A pinion 102 is 'fixed onshafti80and meshes with a rack 98 sliding through a guide 97 swiveled on the shaft 80 and having its Ylower end pivotally connected as at 12.8' to the lower'tong arm 129.

For holding the tongY arms in adjusted position when the motor 115 is turned olf and especially` for holding the upper tong arm elevated when' the dog ,isv idle, a snubbin'g brake lis provided on the armature shaft l115 and .consists vof 'brake members 119 and 120 provided with friction faces 121 pivotally connected at their lower ends by means of a pin 122 Ato a. bracket 123 secured to the uppertong armV 17 The brake members 119 and 120 have their friction faces held in engagement with a drum 112'keyed to the armature shaft 115 by virtue of the provision of a bolt 126 extending through. apertured lugs on the brakemembers and having its head engaged with one apertured lug' and having itsv other endA provided with nuts 127 serving 'as Ian abutment for one endof a spring 125,

the other end of the spring engaging the other of said lugs.

Assuming that the parts are in their respective positions as shown in Fig. l, it will be seen from the foregoing description that uponl operation of motor 115 in one direction theworm 104 through'lworm gear 89 will rotate shaft-80 and pinion 102 keyed thereto and that shaft 80 may thereby be` lrotated in a clockwise directiomas viewed about shaft Las. a center, pin 18 sliding downwardly along slot 23. The upper end ofslot 23 is curved on the arc. of Va circle having shaft 15 as a centerto permit arm 17 to move about the latter asaY center during sliding movement of pin 18 in the upper end ofslot l23. Downward movementof pin 18 in slot 23 below the position of the pin shown in Fig. 1 will cause arm 12 to move .forward slightly in a counter-clockwise direction about shaft13 as a center and spring 46 to be compressed between pin 43` and nuts 47. Vhen tooth 130 engages log 132 tong arm 17 i' and'pinion 102 carried thereby will be held against further downward movement. Upon continued rotation of pinion 102, therefore, rack 98 will be drawn upwardly through housing 97 to pull lower tong arm 49 upwardly and cause the tooth133 secured to the latter to be embedded in the underside of the log, tongV arm 49 being moved upwardly until the teeth 130 and 133 are embedded in the log 4with the same force, at which time worm gear 89 will slip completely with respect to shaft by reason of its friction connection with Vthe latter. Y

When the Sawyer observes that the tong arms have been moved together a suiiic-ient amount to grip or hold the log, he shuts down motor 115. When the logisto be released,-- motor is reversed to move the tong arms.

17 and 49 away'from each other. Y

If it is desired to project teeth130 and 133 a greater distance beyond the face of knee 1 to hold a comparatively large log, motor 115 is operated to move tong arm 17 upwardly until pin 18 is above'the upper ends 31 and-31 of strips 24 and 25 and beyond channel 23 formed bythe latter. Shaft 32 is then rotated by means hereinafter described in a counter-clockwise direction, as viewed in Figs. 1 and 7, until block 54 engages stop 57, stop 57 beingadjusted to permit rotation of sha-ft 32 through 180 degrees from the posi- .tion thereof shown in Figs. 1 and 7. Lever 37 will thus be rotatedin a counter-clockwise direction aboutrocker shaft 13 and cause bolt 48 to act against the adjacent edge ofarmV 12 to move Vtong arm 17 forward, the eccentricity 'of eccentric 33 and the relation betwen arms 39 and 40 of lever 37 being such that pin 19 is moved into'alig'nment with slot 23 for sliding movement therein.` At the same time,

' crank pin 53 will also move through `180Ov from the position thereof shown in Figs. 1

and 7, and thus kcause tongl arm49 to slidein shoe 59 in a direction transverse'to the face of knee 1, tooth 133 thereby being projected forward beyond the Vface of knee 1 a distance equal substantially to the throw of crank pin 53, this distance being equal to the dis,-

tance which tooth is projected beyond the to the right of the vertical through rock-ershaft 13 so that during the Vmovement of crank pin 53V in a counter-clockwise direction through the first 90?, pin 51 will move'downwardly to compensate for the upward movement of pin 53.` Inthis connection it will be *seen that ,if the rear end 4of lower tong:l arm .49 were connecteddirectly to-crank vpin 53,

as shown in themodiied formin Fig. 8, the

rear end of the tong arm would be moved upwardly with pin 53 and causearm49 to tilt a` considerable amount about pin129 as a center. The parts are so arranged that when pin 53 reaches its uppermostposition V'pin -51 is in its lowermost position. 'During movement of pin 53L in a counterclockwise direction through the last 90, therefore, the latter will move downwardly, butQpin 51 will compensate for this movement by moving upwardlyabout'shaft 13 as ,a center. .By employing the hanger 50 and connecting the rear end of tong arm ,49'to cra-nk pin` 53 by means of link 52, therefore, f rotary movement' of tong arm 49 in avertical plane about pin 129 as a center upon'rota'tionofshaft 32 is minimized,arm 49 being thereby maintained in substantiallya horizontalv plane during move- Ament thereof in aV direction transverse tothe" faceofkneel. 'Y .g Y* l The uppertong arm17may be provided on the undersideV thereof with a stop 134i arranged to lengage a rubber bumper 135 with which shoe 59 is provided-when .pin-18 is'.k in

slot 23 and with avstop 136 arranged to engage bumper when pin 19 is in slot23 to limit relative movement ofthe tong arms toward each other. A pin 137 is slidably mounted in the upperend of member 27 and backed byY a Y spring 138 arranged'upon a bolt 139 secured to pin 137 and extending loosely through the upperportion 140 of member 27, nuts 141 kbeing threaded upon th-e endy of bolt 139 to limit downward movement of pin 137. A

block 142 is secured to the upper side of ltong arm 17 and arranged to'engage vpin 137, the latter thereby acting as a cushion and a stop to limit upward movement of the tong arm. Anarm 143 may be Asecured to member27 by means of bolts 144and arranged as shown in Figsfl and` 9 to prevent movement of the forward en d of tong arm 17 away from member27 when either ofthe. pins 18 and 19 are "When the teeth 130 and.133 are extended to the fullest extent beyondthe faceof knee 1,.in which position ofthe teeth-'pin 19 of upper tongdog 17;Wll be -in channel 23and moved to av positiongabove the upper ends; 31

crank pin 53 will bein its eXtreme-position to.the left ofthe shaft 32 and block54 against stop 57, the teeth may be receded by operating motor 115 to raise ytong arm 17 and carry pin 19 above the upper end of channel 23.

Shaft-32 is then rotated in a clockwise direcconnectedy thereto backward. 'This rotation` of shaft 32 in a clockwise direction until block 54 engages stop 56 will also cause lower tong arm 49 to slide backward in shoe 59 a distance equal to the distance betweenpins 18 andV '19 whereby teeth`l30 and 133 are receded the same amount to the respective positions thereof shown in Fig. 1, in which position of the teeth the log is held to cut the thinnest board.

The means forV rotating shaft 32 in either direction will now be described. Referring morel particularly to Fig. 2, -a worm gear 145 is VlooselyY mounted on' a member 146 splined t-o shaft 32 and held in frictional engagement by friction discs 147 with a member 148 alsov splined on shaft 32, a spring 149 being held incompression between member 148 and adjustable `nuts 150 threaded uponthei'end of shaft 32 to hold Vgear 145,fri'ct`ion discs 147 v and members 146 and 148 in'properfrictional A suitablev engagementv with each other; housing 151 for these friction elements may be arranged uponshaft 32,'as'shown, and closed by a plate 152 secured to the housing by bolts 153, the housing being provided with suitable bearings 'fora shaft- 154 havinga worm 155 arranged-in mesh with worm `gear 145.A A reversible electric motor 156 is secured by means of bolts 157 to a: bracket 158 secured, in turn, to knee 1 by means of bolts 159. The armature-shaft of the motor 156 is connected to the worm shaft 154 to drive vthe same. Upon operation of motor 156 in a given direction shaft 32 will be rotated in 'a counter-clockwiseV direction to advance or eX- tend teeth 130 and 133 further 'beyond Athe face of knee 1 until block 54 engages stop 56, as explained above,-at whichtime worm gear 145 will slip completely with respect to shaft 32 to permit continued operation ofgmotor 156.v When the teeth have been advanced in this manner motor 156 is shut down. Upon reversal of motor 156 'shaft 32 is rotated in a counter-clockwise direction vto recede A the teeth 130 and 133 to their respective positions as shown in Fig. 1, block 54 engaging stop 56 when the shaft has rotated through180", at -which time worm gear 145 will again'slip completely with respect to shaft 32 to permit continued operation of motor 156 whi'clima'y then be shut' down. A fcap- 162 may be placed over the end ofV shaft 32 and secured to platel1'52 by means of bolts 163.

As shown `in Fig. 8, Vthe rear end of the llower tong arm 189 to which the lower end of eration as the corresponding parts shown in F ig. 1, and are designated by primed referaence numerals similar to the reference numerals of the corresponding parts shown in Fig. 1.Y i I 'lheinventiony claimed is: 1. In asawmill dog, a knee having a face and provided with a channel arrangedpar- .allel thereto, upper and lower log-holding arms associated with said knee and mounted for movementk towardand away from each other and for movement transverse to the face ofsaid knee, and means foreffecting said movements of said arms, saidmounting including a pluralityY of pinscarried by one of;said arms and vadapted"'andarranged for rmovement in said channel,and means for selectively positioning saldi. pins 'insaid :channel for movementtherein whereby the position of saidLlast-mentioned arm Vrelative tosaid knee "may be changed in a direction transverse to the facetof the latter.

2.*In a` sawmilldog, a knee having a face and provided with'a channel arranged vparallel thereto, upper and lower log-holding arms vassociated with said knee and Amounted for movement toward andaway from each other and for movement transverse to the face of. said4 jknee, a plurality of pins carried by one ofsaid arms and .adapted and arranged for movement in said` channel, means for selectively positioning said pins in said channel for movement therein whereby the position lof said' last-mentioned arm with respect to said knee may be changed in a direction transverse to the face of the latter, a shoe guided formovement parallel to the ace of said knee and. supporting the other of said arinsfor Ysliding movementwith'respect to said shoe, means for causing said sliding movement ofsaid other arm whereby the position ofthe samewith respect to said knee vmay be changed in a direction transverse to thefac'e of the latter, and means tfor effecting saidA movement of said arms toward and away vfromeach other.

3. In a sawmill dog, a knee having a face, upper and lower log-holding armsl associated v with said knee and mounted for movement toward and away from each other and for movement transverse to the face of said knee, a lever pivotally mounted intermediate its ends to said knee and connectedto one of said arms, a shaft connected to said lever and to the other of said arms whereby the latter are moved forward and in a directiony transverse to the face of said knee upon rotary movement of said shaft in al given direction and are retracted upon a reverse movement of said shaft, means for causing said movements of said shaft, and means for effecting said movement of said arms toward and away from each other.

4. In a sawmill dog, a knee having a face, a log-holding arm associated with said knee and supported for vertical movement and for movement in a direction `transverse to the knee fac-e independently of said vertical movement, an actuating member cooperable with the arm to positively move the same outwardly and a spring interposed between the actuating member and the arm to kprovide a yieldable connection between said actuating member and the arm in respect of movement in an opposite direction.

5. In a sawmill dog, a knee having a guideway Valong one side thereof, and a log-holding arm having spaced lateral projections selectively engageable withlsaid guide-way.

G. In a sawmill dog, a knee having a member disposed adjacent one side thereof and formed with a guide-way terminating adjacent the topof the knee, a log-holding arm having a plurality of laterally projecting members selectively engageable with the guide-way, means for moving the log-holding arm vertically to move either of ksaid laterally projecting members into or out of the `guide-way and means for moving the logholding arm transversely of the knee to aline any one of its laterally projecting members with the guide-wav.

7. In a sawmill dog, a knee having a face,

upper and lower log-holding` arms, means for mounting the forward portions of the log-holding arms on the knee for movement Jtoward and away from each other and for movement transverse to the knee face, a shaft mounted on the knee, links between Vthe shaft and the rearward end portion of the upper log-holding arm whereby to support the upper log-holding arm and permit the same to swing vertically and also move transversely to the knee face, means supported on the upper' log-holding arm for moving the upper and lower log-holding arms toward and away from each other, said lower log-holding arm having means for supporting its rearward end on said shaft and power means for moving the log-holding arms transversely of theV knee face.

8. A power sawmill dog of the tong type comprising a knee having a face, upper and lower elongated tongs, means coacting with the ee for constraining the tongs to up and down movement toward and awayfrom eachother and for movement transverse to theknee face to project face to Vgreater or less distances,tthe space between said tongs forward of the knee being unobstructed so as to permit the work to engage the face'ofl the knee in all positions of the tongs, a swingable supporting and driving member mounted on the knee and pivotally connected to the rearward end of the upper tong at a substantial distance from the knee face, a motor, means actuated by the motor and cooperable with saidsupporting and driving member for swinging the same to move the upper tong transversely relative to the knee face, means for' supporting the rearward end of the lower tong at a point spaced vertically from the pivot of the upper dog on'its swingable support in suoli manner as A transversely back and forth relative to the knee face and up and down toward and from the upper tong, means actuated from said motor for moving the lower tong transverselyback and forth relative to the knee face,

and motor driven means for moving the upper and lower tongs toward and away from each other.

' 9. A power sawmill dog of the tong type comprising a knee having a face, upper and lower elongated tongs, means coacting with the forward portions of the tongs and with the kneev for constraining the tongs to up and down movement toward and away from each other and for movement transverse to the knee face, a swingable supporting and driving .member mounted on the knee and pivotally connected to the-rearward end of the upper tong at a substantial distance from the knee face, a motor,a lever operatively associated with said supporting and'driving member, a shaft driven from the motor, an eccentric on the shaft operatively connected with the lever, means actuatedfrom the shaft for moving the lower tong transversely back and forth relative to the knee face, and motor driven means for moving the tongs up and down.

In witness whereof, we hereto affix our signatures.

ROSS E. LANGILL WILLIAM B. GRUETER.

forwardly of Vsaidv to permit it to be moved Vll@ la@Y 

